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Preparation and utilization of sub-5 nm PbO2 colloid as an excellent co-catalyst for Pt-based catalysts toward ethanol electro-oxidation

Abstract

In order to improve the utilization and performance of Pt-based catalysts used in direct ethanol fuel cell, commercial Pt black catalyst was modified by PbO2 nanoparticles with a mean size of 4.59 nm. Electrocatalytic tests demonstrate that the as-prepared Pt black-PbO2 hybrid catalyst possesses a much higher catalytic activity and longer durability than commercial Pt black for ethanol electro-oxidation. Specifically, Pt black-PbO2 hybrid showed an onset potential that was about 98 mV less positive, together with a peak current density 4 times higher than that observed for commercial Pt black catalyst in the cyclic voltammogram tests. The ratio of current densities per unit Pt mass on Pt black-PbO2 and Pt black catalysts is 35.5: 1 for the long-term (2 hours) chronoamperometric experiments measured at -0.4 V (vs. SCE). The in situ FTIR spectroscopic studies reveal that Pt black-PbO2 (4:1) catalyst holds an excellent activity for breaking the C-C bond of ethanol, which is 3.21 times higher than that of Pt black catalyst at 0 V (vs. SCE).

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Publication details

The article was received on 19 Jul 2017, accepted on 05 Sep 2017 and first published on 05 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ02620J
Citation: New J. Chem., 2017, Accepted Manuscript
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    Preparation and utilization of sub-5 nm PbO2 colloid as an excellent co-catalyst for Pt-based catalysts toward ethanol electro-oxidation

    W. Yang, Q. Zhang, H. Wang, Z. Zhou and S. Sun, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02620J

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